<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>模板</title>
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/axios@0.12.0/dist/axios.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/lodash@4.13.1/lodash.min.js"></script>
</head>
<body>

<span v-once id="v1">这个不会改变: {{ msg }}</span>

<p id="v2">Using mustaches: {{ rawHtml }}</p>
<p id="v3">Using v-html directive: <span v-html="rawHtml"></span> </p>


<div id="example">
    <p>Original message: "{{ message }}"</p>
    <p>Computed reversed message: "{{ reversedMessage }}"</p>
    <p>Method reversed message: "{{ reversedMessage2() }}"</p>
</div>

<div id="watch-example">
    <p>
        Ask a yes/no question:
        <input v-model="question">
    </p>
    <p>{{ answer }}</p>
</div>

<template v-if="loginType === 'username'">
    <label>Username</label>
    <input placeholder="Enter your username">
</template>
<template v-else>
    <label>Email</label>
    <input placeholder="Enter your email address">
</template>

<script>

    var v1 = new Vue({
            el: '#v1',
            data: {
                msg: 'this is a message'
            }
        })

    var v2 = new Vue({
            el: '#v2',
            data: {
                rawHtml: '<span v-html="rawHtml"></span>'
            }
        })

    var v3 = new Vue({
        el: '#v3',
        data: {
            rawHtml: '<span v-html="rawHtml"></span>'
        }
    })

    var vm = new Vue({
            el: '#example',
            data: {
                message: 'Hello'
            },
            computed:{
                reversedMessage:function () {
                    return this.message.split('').reverse().join('')
                }
            },
            methods: {
                reversedMessage2: function () {
                    return this.message.split('').reverse().join('')
                }
            }

        })


    var watchExampleVM = new Vue({
        el: '#watch-example',
        data: {
            question: '',
            answer: 'I cannot give you an answer until you ask a question!'
        },
        watch: {
            // 如果 `question` 发生改变，这个函数就会运行
            question: function (newQuestion, oldQuestion) {
                this.answer = 'Waiting for you to stop typing...'
                this.debouncedGetAnswer()
            }
        },
        created: function () {
            // `_.debounce` 是一个通过 Lodash 限制操作频率的函数。
            // 在这个例子中，我们希望限制访问 yesno.wtf/api 的频率
            // AJAX 请求直到用户输入完毕才会发出。想要了解更多关于
            // `_.debounce` 函数 (及其近亲 `_.throttle`) 的知识，
            // 请参考：https://lodash.com/docs#debounce
            this.debouncedGetAnswer = _.debounce(this.getAnswer, 500)
        },
        methods: {
            getAnswer: function () {
                if (this.question.indexOf('?') === -1) {
                    this.answer = 'Questions usually contain a question mark. ;-)'
                    return
                }
                this.answer = 'Thinking...'
                var vm = this
                axios.get('https://yesno.wtf/api')
                    .then(function (response) {
                        vm.answer = _.capitalize(response.data.answer)
                    })
                    .catch(function (error) {
                        vm.answer = 'Error! Could not reach the API. ' + error
                    })
            }
        }
    })

</script>
</body>
</html>